Choose the letter of the best answer. Write the chosen letter on a separate sheet of paper, 1. Which of the following is NOT one of the four subsystems of the Earth? A. biosphere C. water sphere B. hydrosphere D. geosphere 2. All of the waters, including subsurface and atmospheric water comprise the Earth. Which geological subsystem best label the statement? A. the geosphere C. the biosphere B. the hydrosphere D. the atmosphere 3. Earth contains all living organisms including those on the land, in the water and air. Which subsystem best describes the statement? A. biosphere C. atmosphere B. hydrosphere D. geosphere 4. Which subsystem suits the statement "Global ecological +​